“There is only one way in which the murderous death agonies of the old society and the bloody birth throes of the new society can be shortened, simplified and concentrated, and that way is revolutionary terrorism.”
– Karl Marx, “The Victory of the Counter-Revolution in Vienna”, Neue Rheinische Zeitung, Nov. 7, 1848.

“Among all the nations and sub-nations of Austria, only three standard-bearers of progress took an active part in history, and are still capable of life — the Germans, the Poles and the Magyars. Hence they are now revolutionary. All the other large and small nationalities and peoples are destined to perish before long in the revolutionary war-storm. … [A general war will] wipe out all these racial trash down to their very names. The next world war will result in the disappearance from the face of the earth not only of reactionary classes and dynasties, but also of entire reactionary peoples. And that, too, is a step forward.”
– Friedrich Engels, “The Magyar Struggle,” Neue Rheinische Zeitung, January 13, 1849.

“We would be deceiving both ourselves and the people if we concealed from the masses the necessity of a desperate, bloody war of extermination, as the immediate task of the coming revolutionary action.”
– V.I. Lenin, “Lessons of the Moscow Uprising”, Proletary, No.2, 29 August 1906.

“For us, we were never concerned with the Kantian-priestly and vegetarian-Quaker prattle about the ‘sacredness of human life’.
– Leon Trotsky, Terror and Communism 1920 (Toned-down for the Western audiences as Dictatorship Versus Democracy, Workers Party of America, 1922, p.63.)